Chemistry:Strontium hexaboride

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Strontium boride
Strontium boride
Names
Other names
strontium hexaboride
Identifiers
3D model (JSmol)
EC Number
  • 234-969-8
Properties
SrB6
Molar mass 152.49 g/mol
Appearance black crystalline powder
Density 3.39 g/cm3, solid (15.0°C)
Melting point 2,235 °C (4,055 °F; 2,508 K)
insoluble
Structure
Cubic
Pm3m ; Oh
Hazards
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
0
1
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is ☑Y☒N ?)
Infobox references

Strontium boride (SrB6) is an inorganic compound. At room temperature, it appears as a crystalline black powder.[1] Closer examination reveals slightly translucent dark red crystals capable of scratching quartz.[2] It is very stable and has a high melting point and density. Although not thought to be toxic, it is an irritant to the skin, eyes, and respiratory tract.[1]

Magnetism

Strontium boride, along with other alkali-earth metal borides, has been shown to exhibit weak ferromagnetism at low temperatures.[3] This is thought by some to be caused by slight impurities or aberrations in the crystal lattice,[4][5] while others suggest different explanations are needed.[6] Strontium boride has also been examined for semiconducting properties at lower temperatures.[7]

Preparation

In his book The Electric Furnace, Henri Moissan describes an early synthesis of strontium boride by mixing strontium borate, aluminum, and carbon in an electric furnace.[2] Alternatively, a solid-phase synthesis of strontium boride can be carried out by reacting two moles of strontium carbonate with three moles of boron carbide and one mole of carbon inside a vacuum furnace.[8]

Uses

Strontium boride is used in insulation and nuclear control rods.[8] A recent patent filed for aircraft windows uses SrB6 nanoparticles in a transparent acrylic sheet. The IR-absorbing properties of these nanoparticles prevents the transmittance of infrared wavelengths while still allowing the transmittance of visible light.[9]

References

  1. ↑ 1.0 1.1 "Archived copy". http://www.espimetals.com/msds%27s/strontiumboride.pdf. 
  2. ↑ 2.0 2.1 Moissan, Henri. The Electric Furnace.
  3. ↑ Young, D. P.; Hall, D.; Torelli, M. E.; Fisk, Z.; Sarrao, J. L.; Thompson, J. D.; Ott, H. R.; Oseroff, S. B. et al. (1999). "High-temperature weak ferromagnetism in a low-density free-electron gas". Nature 397 (6718): 412–414. doi:10.1038/17081. PMID 29667965. Bibcode: 1999Natur.397..412Y. http://www.escholarship.org/uc/item/02g0m3m6. 
  4. ↑ Shang, S.; Liu, Z. (2007). "Thermodynamics of the B–Ca, B–Sr, and B–Ba systems: Applications for the fabrications of CaB6, SrB6, and BaB6 thin films". Applied Physics Letters 90 (9): 091914. doi:10.1063/1.2710081. Bibcode: 2007ApPhL..90i1914S. 
  5. ↑ Gavilano, J. L.; Ambrosini, B.; Ott, H. R.; Young, D. P.; Fisk, Z. (2000). "Low-temperature NMR studies of SrB6". Physica B: Condensed Matter 281: 428–429. doi:10.1016/S0921-4526(99)01197-7. Bibcode: 2000PhyB..281..428G. https://escholarship.org/uc/item/3cm06273. 
  6. ↑ Dorneles, L.; Venkatesan, M.; Moliner, M.; Lunney, J.; Coey, J. (2004). "Magnetism in thin films of CaB6 and SrB6". Applied Physics Letters 85 (26): 6377–6379. doi:10.1063/1.1840113. Bibcode: 2004ApPhL..85.6377D. 
  7. ↑ Ott, H. R.; Chernikov, M.; Felder, E.; Degiorgi, L.; Moshopoulou, E. G.; Sarrao, J. L.; Fisk, Z. (1997). "Structure and low temperature properties of SrB6". Z. Phys. B 102 (3): 337–345. doi:10.1007/s002570050297. Bibcode: 1997ZPhyB.102..337O. 
  8. ↑ 8.0 8.1 Zheng, Shu-Qi; Zou, Zeng-Da; Min, Guang-Hui; Yu, Hua-Shun; Han, Jian-De; Wang, Wei-Ti. "Synthesis of strontium hexaboride powder by the reaction of strontium carbonate with boron carbide and carbon". Journal of Materials Science Letters 2002 (21): 313–315. 
  9. ↑ "United States Patent Application 20090093578". http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1=%2720090093578%27.PGNR.&OS=DN/20090093578&RS=DN/20090093578. 



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